IOC: 31 possible Rio Olympians failed drug tests in Beijing

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The IOC plans to retest athletes who competed at London 2012.

Story highlights

IOC finds drug offenses in 2008 retests

Plans to retest London 2012 athletes

Samples are kept for 10 years

Aims to clean up sport for Rio Games

(CNN)Thirty-one athletes hoping to compete at August's Olympics tested positive for banned substances at the 2008 Beijing Games and could now be ruled out of Rio, the International Olympic Committee says.

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"All those athletes infringing from anti-doping rules will be banned from competing at the Olympic Games Rio 2016," it added.

Tuesday's revelation only thickens the black cloud surrounding drugs and the Olympics, much of it involving Russia -- whose track-and-field athletes were banned from competing from Rio this year due to regular doping in the past.

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The former head of its anti-doping laboratory, Grigory Rodchenkov, told the New York Times this month that more than half-a-dozen Russian medal winners were doping at the 2014 Sochi Winter Olympics.

Rodchenkov claimed he obtained the tainted samples and then helped to mask the illegal drugs by mixing in liquor.

The IOC said Tuesday it plans to conduct retests from 250 athletes who participated at the London 2012 Games and who potentially could participate in Rio.

Further, any athletes set to be awarded medals because others have been disqualified face having their samples -- which the IOC keeps for 10 years -- retested.

"All these measures are a powerful strike against the cheats we do not allow to win," IOC president Thomas Bach said in the statement. "They show once again that dopers have no place to hide.

"The retests from Beijing and London and the measures we are taking following the worrying allegations against the laboratory in Sochi are another major step to protect the clean athletes irrespective of any sport or any nation.

"We keep samples for 10 years so that the cheats know that they can never rest.

"By stopping so many doped athletes from participating in Rio we are showing once more our determination to protect the integrity of the Olympic competitions, including the Rio anti-doping laboratory, so that the Olympic magic can unfold in Rio de Janeiro."

WADA investigation

The IOC requested that the World Anti-Doping Agency begin an investigation into the allegations made by the New York Times, "that testing at the Sochi Laboratory was subverted."

"Based on this investigation, the IOC will take swift action," it said.